@article{fdi:010086132,
  title = {{I}nfluence of the {G}ulf of {G}uinea islands on the {A}tlantic {E}quatorial {U}ndercurrent circulation},
  author = {{N}apolitano, {D}. {C}. and {A}lory, {G}. and {D}adou, {I}. and {M}orel, {Y}. and {J}ouanno, {J}ulien and {M}orvan, {G}uillaume},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the easternmost portion of the {G}ulf of {G}uinea, {B}ioko {I}sland marks the beginning of an island chain that stretches {NE}-{SW} to the {E}quator, where {S}ao {T}ome {I}sland sits in the path of the {E}quatorial {U}ndercurrent ({EUC}). {I}n this study, we explore the meso-to-large-scale effects of local flow-topography interactions that escalate from the {EUC} encounter with the {G}ulf of {G}uinea islands. {A} mean shipboard {A}coustic {D}oppler {C}urrent {P}rofiler section captures the {EUC} as a strong subsurface jet that ultimately hits {S}ao {T}ome. {M}otivated by these observations, we ran two ocean general circulation model simulations that differ by the presence versus absence of the {G}ulf of {G}uinea islands. {D}iagnostics of salinity and potential vorticity ({PV}) from these simulations show that the {EUC} bifurcates at 6 degrees {E}, triggering mesoscale activity that spreads the {EUC} waters. {O}n both sides of {S}ao {T}ome, the {EUC} branches roll up into eddies that propagate westward. {T}hese low-{PV} anticyclones carry high salinity through the tropical {A}tlantic, introducing {PV} anomalies along eddy corridors mirrored by the {E}quator. {T}he formation of such eddies is affected by diapycnal and isopycnal mixing and friction, and their distribution between hemispheres is intrinsically related to the location of {S}ao {T}ome. {T}he eddies are modulated at both seasonal and interannual scales. {A} strong {EUC} generates numerous and stronger eddies, while seasonal equatorial upwelling indirectly hinders their formation. {C}onvergence of the {EUC} upstream of {S}ao {T}ome reveals intense downwelling and freshening, whereas divergence and upwelling are associated with the {EUC} negotiating the island.},
  keywords = {{A}tlantic {E}quatorial {U}ndercurrent ; mesoscale dynamics ; flow-topography ; interactions ; tropical {A}tlantic ; {G}ulf of {G}uinea ; islands ; {ATLANTIQUE} ; {ZONE} {TROPICALE} ; {ZONE} {EQUATORIALE} ; {GOLFE} {DE} {GUINEE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {O}ceans},
  volume = {127},
  numero = {9},
  pages = {e2021{JC}017999 [26 p.]},
  ISSN = {2169-9275},
  year = {2022},
  DOI = {10.1029/2021jc017999},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086132},
}